"Encountered problem" message when closing

[David Crow]

What is the program doing when it closes? Are you able to comment out all nonessential code and still reproduce the problem? Does this happen in debug or relase mode, or both?

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"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

[acerunner316]

Just looking at the OnCancel() function, all I do is call a function that closes a driver (my program uses SDK provided to access drivers). I also deallocate a pointer to an array if its allocated. if (ptrArray) { delete []ptrArray; ptrArray = 0; } I thought this might be causing a problem, but I've had the "encountered problem" message before I put this code in. It occurs in both debug and release mode.

[David Crow]

acerunner316 wrote:

It occurs in both debug...

So what happens if you start the program using F5 (instead of Ctrl+F5)? Do you get any useful text in the debug window?

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"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

[acerunner316]

I get this sometimes HEAP[.exe]: Invalid Address specified to RtlFreeHeap( 00390000, 0010F57C ) or sometimes i get The program .exe exited with code 0x2 I guess I should also note that I don't really know how to use the debugger. I'm a Visual C++ noob. I only use debug and release to check that my code works the same on both, and works as expected.

[David Crow]

acerunner316 wrote:

HEAP[.exe]: Invalid Address specified to RtlFreeHeap( 00390000, 0010F57C )

At any point in time are you changing the value of ptrArray?

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"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

[acerunner316]

oh i just realized, i do intend to change the value, but it doesn't. The ptr is 0 or NULL when i'm not using it, but when i do, i use the new operator. I should really be using malloc so that it returns a pointer value, instead of taking the chance of trying to allocate (new) to ptr 0. Could that be the problem? But then why would it crash only when I close.

[prasad_som]

How you have allocated memory for ptrArray. Can your show. One possible cause I see is deleting this memory twice(unintentionally may be).

Prasad Notifier using ATL | Operator new[],delete[][^]

[David Crow]

acerunner316 wrote:

I should really be using malloc...

No, you shouldn't be.

acerunner316 wrote:

But then why would it crash only when I close.

Check the value of the pointer variable after new is called and before delete is called.

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"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

[acerunner316]

Just to determin whether that was indeed problem, I got rid of the dynamic allocation of memory to that array. Instead, I set it to a fixed array size when its declared. But I still get that windows error message.

[acerunner316]

Can someone explain PostNcDestroy()? I saw it in some sample code, and I tried to look it up but couldn't quite understand the need for it.